Direct-acting engine.



DIRECT ACTING EN GGGGG APPLI ooooooooooooooooooooooo .y

' riNrrEn sfrAfrns GEORGE D. HUNTER, ,oir

"PATENT fori-non.

BLOOMINGTON, vIN DIANA, ASSIGNOR TOk SULLIVAN MACHINERY COMPANY, OF OLAREMONT, NEW HAMPSHIRE, A CORPORATION MAINE.

DIRECT-ACTING ENKG'INE.

'Specification of," Letters Patent. Application liled September '1,1'904. .Serial No. 222.974.

Patented Jan'. 22,1907."

i pacification, like letters ony the drawings l representing like parts.

'My inventionconsists in improvements in direct-acting engines, being more particulai-ly concerned with chopper en ines'" intended for application to stone c iann'eliiig machines.

My invention relates vpaiticiilarly to means l'or maintaining the desired upstroke or lift to the piston travel and for permitting the use of a heavy or light lilt to the piston as may he required'witli the varying conditions' ol' use. f l

Iiiiny present invention I have appliedtt'o a direct-acting engine` a regulating.. device Y whereby the area of the exhaust-port leading -l'i'oin the head or upper endhof thel cylinder may he throttled to' any desired extent Wholly independently of the action of the controlling valvo'or valves andalso without eiiect upon either of the admission-passages or upon the remaining exhaust-passage leading l'roin the opposite or tool end` of the cyl; er. By this means the pressurewhich is caught in the head end ol the cyliiidcronthe return piston-stroke through its inability tocscape out of the throttled exhaust-passage forms a4 cushion, .against which the piston strikes on, its np'stroke after release of. the

tool from the stone and b -f which it is grades.` all brought to restwit outfinjury to the cy inder-liead or otherpart'thereof. By de'- creasing the tlirottledarea the travel o the iipstrokeoi' the iston may be shortened and hy increasing tie are the travel may be lerigthened. Since this does not effect the action of the controlling valve or valves, the latter `may be adjusted in their most effective position and the full ower of the engine de veloped, il desired, oth in delivering the blow andI in withdrawing the tool 'from the cut, irrcsectiveof the controlled len th of travel. i loreover, the regulator iiiay ie adjusted to correspond to the lift which varying conditions will require. Since the con' trolling valve or valves operate independ section, partly -liead end thereof --is also vprovided .withsepa .desired way-fas, for example, bythe' use of ently of the regulator, the latter maar be iid- I justed to give the cylinderthebene 't of the entire area of the exliaust-port or any porf tion thereof, and tlieengine, therefore,with. out the alteration of anyart thereof may be 'employed where iio varia le regulation 'of the piston lift is necessary. j Y 6o My" invention' will be best understood by reference to the following description, wlien.l taken in connection with .the accompanying illustration, of one specilicvl emhodiixient n"if` thereof, while its scope will he more particuy larly'p'ointedout int eappended'claims-. 1 i In thedrawin s, Figiirel is -a longitudinal roken away, of'v an .engii'ie einbodyiir one formof my invention and showing t e inain pistonfcoiitrolliii'g"fvalve, 79 together with head-end exhaust-passage con-1iI trolled as herein described. Fig 2is`aseef tional plan view4 on the line 22 in Fi'g'nl, showing the exhaust-regulators. r f1 Referring to the drawings,- the cylinder. a' 7, has slidable therein a usualjormcf piston 6,111' connected to the 'piston-rod-c, the oiiteig,ei'id,v of Whichlnot shown) is adapted .tolte rectly connected to a tool or apart carrying at' tool, such as the reciprocating.tool-carryingz. cross-head ofa chop exi-engine. The tool end of t e cyli der has siiiab separate andiifndependent admission and ex;A l haust passages .d and e, respectively, andthe? j rate and independent admission and. ex. l haast passagesfand g, respectively, the said admission and exhaiistpassagesat both'ends I ofl the cylinder communicating indepeiidently of one another withthe c` `linderand f9`o thesteamchestand exhaust.` f T e said pasf'f sages lead through the .valve-plate h iitr'i`the steam-cliest i,,whereincommunication .be-:

tween the saine and siiitable-admis'sionjiorts N 5, j j anda centrally-located exliaiist ort k is '95 controlled bya halai'iced piston-va' ye l, lo catel'in aK chamber between thebpffers m andan Thopiston-valve' may be operatediiiany,l

additional rcversingand cut-oil' valves, the` latterheing ordinarily connected to and operated by vthe engine cross-head and acting to adiiiit steam ,between ends of the pistonvalve Z and the biill'ers to move t'hepsaid los valve at appropriate times .and also properlyA 4 fcornpri'sing the regulating-serewv p, which vary the available opening from the head end to out oil the admission ot steam from the admission-ports j. This type of engine and this construction of reversing and cut-oil' valves are well known; but aknowledge thereof is. unnecessary to an understanding .oli'my present invention, and 1 have not illustrated the same herein. '1"' Referring more particularly to' Fig.' 2, f nave shown 'means for yaryi ofsthehead-end exhaust-port g, such mean's ters the side of the valve-plate z and may be adJusted to any desired position' and ai ts to of the cylinder to the atmosphere, a lock-nut V- q being employed, if desired, to set th'e same in any selected position until readjustment is desired, which may be etlected ,in any desired way, as by a handle (not shown) applied'. to the projecting end of the srrew.

ln the engine hereinshon n there is also employed a regulating-gate i', which herein is a valve lying at ross the exhaust-passage in the lower part of the steam-chest t' and adapted to be turned by means of the outwardly-projecting stem s to intercept more or less the exhaust from the tool end= exhaust-passage c, and thereby to ushion the blow on the working piston-stroke should the tool miss or fall short ol the work. lhe stem s on the gate Ir is provided with a leyer t, through which the said gate 1' may be controlled by the operator at will duringjhe op- .'mation of the engine and to conform to the varying requirements ot the work( The operation oi" the engine herein described is as follows; ',lhe controlling-valves being adjusted to their most ettecti've or any desired position, t-he steam. which is herein assumed, for the sake of illustration, to be the moti'vepower, is admitted to the chopper-engine cylinder, and the pressure entersl the,'atInnssion-portf at the head Aend ol the 'cylinder and l'orees the piston don'nn'ardly to give the workingstrolu to the drill or other tool attached thereto. Should the tool miss or fall short ol' its work, the blow may be cushioned by the steam caught in the bottourotthe cylinder. the cushioning elleet of which may be regulated by the adjustable gato r.- ()n the return stroke, alt-er release ofthe tool, the piston is brought to rest by the steam-.throttled and caught in the upper endol'tho 'vlinder` and the amount ol' lil't or' upstrokewilltherefore be determined by the `position ol?A the regulating and throttling isi-,mut i Ll'lthe'piston has too much lil't or up- -istiro le; the yregulaling-screw is then turned until it throttles the exhaust-steam ie top oll `the piston in the cylinder to 1 nl, necessary to give the desired lil't or ups ol\'e. ll' lil`t, or upstroke is wanting, the "Ft-gillamig-screw is then turned out\\"ardly to open'up aslarger-area to the atmosphere,v Athus relieving the` pressure ol steam oyer the ug the eapaeityiY top ot the piston sufficiently to increase.' the piston litt lt will be noticed that this method of yarying the lift of the piston ldoes not atleet .the power which may be given to the upstroke, but that as great power may bc developednpon the upstroke with a .shorter lift as with a longer one.

' lt will be obvious that my invention may be Vwidely varied inform, detail, and arrange- Ynient of parts, unnecessary here to recite, trom the embodiment by which l. have here.- -jin illustrated the same; but it is to vbe under- ',stood that these changes and moditications,

those skilled in the art, are included the scope ot' my invention.

claiml. A direct-acting engine for stone-channeling machines or the like, comprising a cylinder', a piston movable therein, a pistonrod adapted to be connected directly to a drill or other tool, admission and exhaust passages independently communicating with the steam chest aiu exhaust and with the, head end and tool'end of said cylinder, valved means tor Icontrolling the admission to and exhaust. 'from both ends ot said cylinder, a valve for varying the area of' the cxhaust-passage in the head end ot the cylinder, mounted for movement transversely of the exhaust-.passage to regulate thoexhaust within its controll'ing-yalve to thereby control the. inward stroke ol' the piston after release ot' the tool, and au adjustable gate in-the exhaust-passage in the tool end of the cylinder, to regulate the eyhaust in said tool end independently 'of the admission-passage and its controllingyalye to thereby control the i working or outward stroke ot the piston.

:2. A diteet-:u-.ting engine for stone-channeling machines or the like, comprising a. cylinder, a piston movable therein, a piston-rod adapted to be connected directly to a drill or other tool, admission and exhaust passages independently communieating with 'the steam chest and exhaust and with the head end and tool end ol' said cylinder, valved. means for controlling the admission to and valve mounted l'or movement transversely ol' the exhaust-passage in the head of the cylinder lo regulate the exhaust imlepemlently oll the admission-passage and its controllingvalve to thereby edntrolithe inward stroke. ol the piston after release ol' the tool, and an adjustable gate in the exhaust-passage. in the tool end ol' thecylimler, to regulate the exhaust in said tool end independently ol' the, admission-passage and its con'trolling-valve to thereby control the working or outward stroke ol the pistoni 2i. A direct-acting engine l'or stone-chauneling maehioes or the likeV comprising a (tylinder,a piston movable tlerein, a piston-rod `'as well as others which will he obvious to' independently of the admission-passage and,4

exhaust from both ends of said cylinder, a

IOO

I adapted to be connected directly to a drill or independently communicating with other tool, nadmission and exhaust passages release of the tool, andl an, adjustable gate Ain I5 the exhaust-passage in the tool end of the the l cylinder, to regulate the exhaust in said tool steam chest and exhaust and with the head end independently of the admission-passage end and tool end of said cylinder, valvedl and its controlling-valve to thereby control means for controlling the admission to and i'the-Working or outward stroke of tlie'piston. 2o-

eXhaust fioni'both ends of said cylinder, a

yIn testimony whereof I have signed my Y regulating-screw mounted for longitudinal fname to this specification in the presene of movement transversely of the exhaust-passlge inthe head of the cylinder to vary the ama thereof, whereby the exhanstrnay be regulated independently of the admission.-

passage and its controlling-valve tof therebjf" eontrol the inward stroke of the piston after l 1 two subscribing Witnesses. f

GEORGE D. HUNTER.

Witnesses:

ROBERT T. WALKER," W. G. BoERoWs. 

